James Stewart, New York Times columnist, shares his thoughts on the Justice Department's investigation into high-frequency trading to determine if it violates insider trading laws. I think it's going to be difficult to make criminal charges out of this but I welcome the investigation, says Stewart.

Alcoa is paying $384 million to settle charges with the SEC and Justice Department. Former Microsoft COO Bob Herbold of Herbold Group LLC, and Mary Uhl-Bien, University of Nebraska, provide perspective.

CNBC's Kayla Tausche reports JPMorgan could reach a $2 billion settlement with the Department of Justice this week. The deal could also include a deferred prosecution agreement which would rule out criminal charges.